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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c511074431ef72ab7e96512834f4a2805486aa56376b751c01a6a98a42945be' 
  AND token = '1G7hwXn9n1QirVBSu0u8VPcHSWftwExjevUHZh18ju8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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