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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6abbbf3ff3edf212cdfa8de9292e287a68f6ed11b4a6963b4eecea92a7d8578' 
  AND token = 'twgNeRcDSqfZOCN8YaPqlfLKWB6Aqi58ypKUItzOSy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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