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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97793c3c244b26cab5c9b63affdf9933c3416c67150acedd1bc4d228d16a1b2b' 
  AND token = 'yW8Sxp3JQnAWRGBsH0gwR/D6GHI/+5td00v2B/VYgfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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