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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dbb6100124e50380e5f065db31bb6ec00bd0aa61ac216f89fa4ace5a952282' 
  AND token = 'W/o2+dirhNexOtN/idPl3/eO9uyOXTe3JrwbDDMIGzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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