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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a2a42d57673f4bad4ba0677d1f2689aad69c0bc6ee131bca8badfc1213274b' 
  AND token = 'ojf/r096RJVjg5siCTzpyTqbjojM1f77t1R0NpLHk6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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