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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7374e046679173979613d87b7f0602ee747edff2748624303e3b08b88bc7bacb' 
  AND token = 'gKBE9G3jdTvKJCZU0GvgPHXNZ9ZdpxR9ZtzhCXmu8AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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