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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc4e8988fd7e15b4aad14692bda3445b4abc67e69a934ba9caf6111b1f8be6a' 
  AND token = 'aRk4xSXccm91qeVQvcrdRdLRJFFqmPYDtuBxmNl9x1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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