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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74188797f5d2a7bd6f962826489d71d05944d0fbb93f74f8a6952c55ec1f50' 
  AND token = '367junoYXJtpFNuR6k9kXaj0oOYX1SeaUj3y8BLsuzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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