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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82299af4d84dbb399081d3ea3cfa53fb210349535f06fcab8707d5871755550' 
  AND token = 'CYDrVnpkzcffC2zH9MiXWWwXKOxKpbCG2iUl1KlPKk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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