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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce29074793da43301dd8863d2dc30bca2b0d792a1010e16e64952ad0cc5d8bc7' 
  AND token = 'Gm6kNZQ9+p1O7ziCMxH3VEJWRDZjoGxNoPwO4rlBGr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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