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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403d70ce611ba47ca517738487b81b643986b0ce20e4f8be68d5feb911359d4a' 
  AND token = 'Gvvs0L1t1vhu1R2jnVwW3gYaagnPGNRj1jvd3sDT8lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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