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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f437c559d0ddf3f560a8af1f2767c08ca3ea919979f65b54f45c7c2848a65739' 
  AND token = 'uoyQTbuPHm8t8RvxAvZ56MzKgyAkFZ4LAiWCbLXxCNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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