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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9494317a5eaa77b2c8c3a4b94d7550bba7d5c29bf1b65678fd5ed8027260d3' 
  AND token = 'AFM3mveXIp05rWWflG444BLzQ9SZbdxd1Ze9oPa8oKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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