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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5728faa3c94620011f83f686a64dc6e06629e90f71e892cb39db803f8bfcafd9' 
  AND token = 'Q4zD5SIpmqGveKblWdWZHsEw8N0vQDH0nf3BBWnbMV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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