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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98dc71dbf47dd867576df3f64a57d2b39935bec4298fbd7c4769c4b8d9a5018' 
  AND token = '+6gkZsc9fOCwEQ2fi3Zky9KVJAljt1Q1EzXEEAjralI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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