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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5393ea830f5de8bf81274127ada181a77efdee11ffcc9b81ff09e432460beef1' 
  AND token = 'Ebj1TcYzhyraxr3y/0QtqQiUt39WkQeWwt4IOSPztEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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