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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14d67b5803156b8ef89a1138b3b282002d3091a0923df8ea23726421d218e0d' 
  AND token = 'WJQ/P5+yDy/7uENpWexKJy52ZxbNS8YCZs+0mrL7Wdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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