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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311123fc9048f11203a32643c0e0b7c0a6bf5db4511ad31b0ba10c4eda650681' 
  AND token = 'sSJvm3fnv5DwbJCzZJ1RWo2FKBactOErBG9urccV59w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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