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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03344e47ca3102746f2a6a489a889b49339ab44e19031b34738f32e2e551e0d' 
  AND token = '8elY5iHTcDf7ga3ALV6ur2emV/ilLiLYHXRtrWtpyKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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