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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f7aa279d302a29cb9d03c51d37e61ef24227cc10df8f6aae5972fa43f3098f' 
  AND token = 'YwieDN1oNe1TvseStrr8ZmGqys220Jh1KiKKucvdsSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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