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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb30879c516e3505b3880c160a275c0c7dcb1c6129e895863d53e0949c11e945' 
  AND token = '44khw5HmDG3cznOEkKfrVf4u+YigfRJdVVfo3IG9rQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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