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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7482d9fe41b233e9a611de9965d456feb7e0f2e43d19514510d3b971de2d57' 
  AND token = '9RItZdTE8qvUpedFAH+v307/Unokjxw49OeeLrUyh1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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