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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d945a6f9098c7832416ec02f859fe9f6a1a88d6cb6b89599931570f60f72048' 
  AND token = '31cm+bfhQbc26/7vhvT4PHl4OuNiI3he+CXS4wMCeTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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