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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7118e92ea5c1c82a615b970f098692e998af1cf75ef333a938c4c78520d9e5f8' 
  AND token = 'Sjg0QFcINBGMPZC4tnOrIwzWK+XcC+LRuAefN0rB1V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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