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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c5d6b9bd44b99c968af4134d75de0ea239464976a4f51e5cb592fcdae67a4c' 
  AND token = 'Y4OrsZtT6QMCC0ZE9y9e5jNYAYVy/NsOLeF9yPHmbNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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