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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e5b7748d5090847841d193a3c98d8973adab36e6e7ed2ce64b586ee1829048' 
  AND token = 'W1ZfoD4uTAXgEJncK5zqb05Tp4nqw5iLS9s0GFIASus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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