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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4602cad50277170ee8365f1851fe20fcee05e6a563bb791b195f5ba4043a41' 
  AND token = '6SQnCI8EDOpQxfHrcIoxuzV8ypot63KFMivsYA5pqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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