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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c161a6de0c3391c3cdde5d404868ea5b06e40e07e0857b3da7e36b400ff69e' 
  AND token = 'O0hCLb+wkksxLPYiuuvFSM2+I8A4gaLakecJ1fpGLo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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