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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f94b59b3567eb24f26966c027ab2f56b112f237d3021dbd00bea5631dabfe8' 
  AND token = 'UtCzN1yOWu8jNb2jQVv8dOJMzibfU9KsR3OF67OmjXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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