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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a024e83f2ae99c428912f3aee104eef6083171317e2d8db5b7df5e70e120fd31' 
  AND token = 'OQOUb5vwrUSeBu/CiyvSKM1IuM2y7wJZIRJjx6EvrpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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