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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4bd3317e509e2c3a69e81d11cb000db6f4b4fa3d19febdf2d9fbf0ceddf02e' 
  AND token = 'fyfBQILZ48GNS6tN/5SP1rphDWsCwdF+YKMjdnVN2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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