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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bd334b1c4d45bc58626420b4608d4698ee1bf493305323bbe5548ed0853f94' 
  AND token = 'qqC95JqpkgTdqS2BAOzOs0nyQs6LeFClhU5mHrU6Sp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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