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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d802683bcc994551747c74118c14b22835d3f833605c4f30f03b50fbb69e06' 
  AND token = 'mG6hcIvi2BqyEFSvZP0SJfiwXs1bU4BR8x8CYLU4kJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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