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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e895545537b626033dcab8c468a963469758e60cd2b097a1cd97c86b9f6733' 
  AND token = 'LMFvD2N9cjW67+FRR41I4v0bruO6rz7TLcL4FG+ab50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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