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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96923c2ff2ce91db14a76ecbac52ce60da3a4e69db634e0b087a5ea2d5412b2' 
  AND token = 'aB9Ll1weL2OLprdWbeKYe2o9Q83S38QtlYzQW1K1XSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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