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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1239e66b2644d9c592ae188e21069ffcc48fe1f244a9bf154de44db5631f96' 
  AND token = 'mxrPqQ2oD5oIomX6iwyMu0Vqvma9ytBfGniYxEb9H90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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