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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d392a202a01b9883aa13790dd6a250356461b61da26776579d7567758bfb19' 
  AND token = 'M8ydoSw6Ik/UgnoCU2LapbHC7Y1yPyo5X+V7gwBQ8bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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