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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa7913f1fe9955583979a01ad4aa49ca4660b1ec899643bb97bacf442e7a28e' 
  AND token = 'SZJGrH4w3fLB9foTq5yY/DxQ46L9UY3MkahzW3PH0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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