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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06b1ed83f58caf7db1c00f7317d65bd0b4b2eee217344cf007ae74750ed52c8' 
  AND token = 'tJurot3IAgXx0ku4hf1HAN4p4WMDqD1h7n30lbQE1zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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