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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83cb31667bafb16505a1eafe79a3335fa806d5364b7fd58f1b419f6791cd102' 
  AND token = 'wrQxdHS51SJnxMmWVYSXxrqBDw1014I5B4/92OMGdWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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