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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386747392c6bdbeabd1452a381ac096f1e2de2d8540e6fad0124d9ec08016327' 
  AND token = 'VhD2blafebB8Q6CbdjHm4f0JxW3lm8z6s8rOX7BN3Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}