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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3ffa4c2d069c3cf162a9c6d3b8d8e074d297cffd05c63ada2f83e84c63b4ed' 
  AND token = '4qZGP7J2QxWPeX8VcLXULOOgiunllV1TEa118GtB/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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