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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060090f5def30393f568faaa41dddab6059fee0900b36871a511cecc253f5f0c' 
  AND token = 'Er8k9rrs4Hj7zC4e5g2yoUkS//O/GTizADk+ZeE+0g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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