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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c9736c1e4caa2c53057e03e02b963d25eda9f9c07bca7f5ab4154a38b56eba' 
  AND token = '1wW46nqW5VOzm2F2EXdrxFLldqoqvXRr15/YeyUCXUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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