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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd05819ae8a01de44a59968822d17f9e3ddb86f215f37b0b6706058a687a0ec' 
  AND token = 'QLOx5wUqym6KES1/BjduAhdhwts7eNSZ6QuU5H6a0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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