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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6290b3bd9454b0e1062848938df4815e2b563a3fb9f3f9b01e7fb9cf361d65' 
  AND token = '31SCXged9hcCZ3bWXvc8imnZZpdTQH9jQkROPNjLUDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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