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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7f1eb734d246c2cdc7d4f7ff8ad7b0da1d37fcc0234434b82f1e33bc487336' 
  AND token = 'OSCyMYVNqgaeKowoa/nGDv7a5ni/zVTogBj0VUM6h5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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