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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b984d013e7c5b9dea5d5252e327b803da88ec881bd9f2c30097e04e421330013' 
  AND token = '1UMZKKvGMn1qeQej3w+IPFObK1WY+uVHT9eyYpq7USk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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