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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2548d1b93dbfdc1d64c313387089f5c471ab2c9e1f93fe391b7b4c7a6908087' 
  AND token = '/Vt5+UisunGyp0J4Xa59Vr/AwdQ61HDA7japRjbaFq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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