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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a5a16b36158c2928872d7093e030504209da6cc336e30d435be8f8067e44b6' 
  AND token = 'Olq/T9niDZZaOGrPXI4jkPb+LXavZEzMpnsZ2uf9irE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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