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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6980239ecd6c1068a1d1cbd4e82263af340ffad8c38b7adddbc3ff6575b63685' 
  AND token = 'jfGWeEVY2ZkNSUYu7RC5Hmg8Bq3BNSBwEdLkxWoJDo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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