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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318084124dac8f28f673a85c45a6a3f9704bfbb1b6dd23314f5ab0c131cc76c0' 
  AND token = 'mtWPmKpn9X9IreRmdYI7S2CoVD20F+MSHoIYH85FqA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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