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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eb2636aa7e6ea7ed0525d4d65f7d85419b9c992618dcb8329ddce800a2ddd2' 
  AND token = 'tWa1BLTYwL2KUglKCEpRhgDmYUIbJt1IueRcqgZtQd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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