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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58e681284aae2e9c76551174f3209656a021114bd0472c1b101952a3048919f' 
  AND token = 'eohrbL9TXml3/ecvSLSwqQH/cB5P3cb49CUIEBgAPhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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