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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33686b2308a8254c02989df1b81c680fdf963dca149e45ad8969437f8f4fa89' 
  AND token = 'CpSP0W6D0U6AOFTvJfOQFPI7y51cqpYTqBw07SqqnWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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