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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2985c251f25630f80eb9b9399077a19f7340765d6a3e067c93b3413cf6dbcfaa' 
  AND token = '7boDrwMdfgyJ8A0E0BBzUbhMYHicY7ROx5sEJrTKRLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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