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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eb87a2a32818e3c9f157c32c7416b9471ba28a11201a27161fa11147323f07' 
  AND token = '1a0n2QOVa3b/x0hFsk1CZ02c/ZhZ2oq+dRjg5tDeT9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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